低渗透岩心速敏实验合理注入流量  

Reasonable injection flow rate for low permeability core velocity sensitivity experiment

作　　者：张春华[1,2] 刘卫东[2,3] 苟斐斐 罗莉涛 

机构地区：[1]中国科学院大学,北京100190 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《中国科学院大学学报（中英文）》2016年第5期618-624,共7页Journal of University of Chinese Academy of Sciences

摘　　要：为确定低渗透岩心速度敏感性实验的合理注入流量,基于喉道半径及其分布建立新的不等径毛细管数学模型,并应用有限差分方法对模型求解.模拟过程中,选取3块低渗透率岩心,模拟微粒释放、表面沉积和微粒堵塞等3种因素对岩心渗透率的影响;选取7块低渗透率岩心,模拟注入流量设置对岩心临界流量判断的影响.模拟结果表明,微粒释放和微粒沉积是低渗透岩心渗透率伤害的主要原因;渗透率越低,渗透率伤害越显著,桥堵和卡堵对渗透率伤害越大;当岩心渗透率为（0.1~1）×10-3μm2,执行标准中注入流量时,临界流量判断结果偏大,建议在0.1 m L/min前添加1或2个流量点.In order to study available injection speeds in velocity sensitive experiment for low permeability cores,a capillary model is built based on pore throat radius and distribution, and the finite difference method is used to resolve the equations. The effects of particle release, surface deposition, and particle plugging of three different kinds of low permeability cores on permeability damage are simulated. The influences of different injection solutions for uhralow permeability cores on critical speed are also simulated. Simulation results show that particle release and particle deposition are the primary damage mechanisms for low permeability cores. The lower the permeability of cores, the more remarkable the permeability damage and the stronger the effects of the bridge plug and singlehole blockage on the permeability damage. For the core with permeability smaller than 1 ×10-3 μm2, the injection solution according to SYT5358-2010 is not reasonable and two points should be added under 0. 1 mL/min. The model results provide a theoretical foundation for injection solution in velocity sensitive experiment for low permeability cores.

关 键 词：等径毛细管 速敏 临界流量 低渗透 注入流量 

分 类 号：TE39[石油与天然气工程—油气田开发工程] TE341